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ANALYTICAL METHODOLOGY <br /> 1 Total Petroleum Hydrocarbons (TPH) Extractables by GC-FID <br /> ' Extraction Procedure: <br /> WATER - <br /> A 1 liter sample is poured into a 2 liter separatory funnel. 3x100 ml <br /> ' extractions with methylene chloride (2 minute shake outs) are <br /> completed. The methylene chloride is decanted off and concentrated <br /> to a 5 ml final volume. <br /> SOIL - <br /> A 30 gram, or other appropriate aliquot of soil, is mixed with 10 <br /> M grams of washed sodium sulfate. 100 mis of methylene chloride is <br /> added to the soil and placed on a mechanical shaker for I hour. The <br /> ' liquid is decanted off and the process is repeated with an additional <br /> 50 ml of methylene chloride. The combined solvent extracts are <br /> filtered through sodium sulfate and the extract is concentrated to a 5 <br /> ' ml final volume. <br /> GC ANALYSIS - <br /> ' An appropriate volume of the sample extract is injected into a Gas <br /> Chromatograph equipped with a Flame Ionization Detector (FID), a <br /> ' split/ splitless capillary injector (operated in the splitless mode), and <br /> a fused silica capillary column. The TPH fraction is quantitated as <br /> gasoline and/or #2 diesel fuel (and/or different petroleum <br /> ' hydrocarbon fuel types if requested, such as JP-4 jet fuel) based on <br /> relative retention times and examination of the elution profile. The <br /> TPH fraction quantitation is based on chromatographic peak areas <br /> ' against a multipoint standard curve. <br /> C'OIv nJCI IFM WFWPN OM;ION <br />